RT Journal Article T1 General transpression and transtension A1 Fernández Rodríguez, Carlos A1 Díaz Azpiroz, Manuel A1 Alonso Henar, Jorge AB In this work, a triclinic transpression and transtension model is presented in which the coaxial part of the flow is general, including both constriction and flattening as well as pure shear. The results show that, for both transtension and transpression, the different combinations of the variables that control the model allow obtaining finite strain ellipsoids in all fields of the deformation diagram, including prolate and oblate ellipsoids. It is mainly the ζ angle between the simple-shearing direction and the extrusion (transpression) or sinking (transtension) direction, together with the value of the vorticity, and the characteristics of the coaxial part of the flow, which controls the shape of the finite strain ellipsoid in each case. The orientations of the principal axes (X, Y, Z) of the finite strain ellipsoids show a wide variation, also dependent on ζ. The model has been applied to natural examples, improving the knowledge of their kinematic evolution and tectonic interpretation. PB Elsevier SN 0191-8141 YR 2025 FD 2025-11 LK https://hdl.handle.net/20.500.14352/132504 UL https://hdl.handle.net/20.500.14352/132504 LA eng NO Fernández, C., Díaz Azpiroz, M., & Alonso-Henar, J. (2025). General transpression and transtension. Journal of Structural Geology, 200, 105537. https://doi.org/10.1016/j.jsg.2025.105537 NO Ministerio de Ciencia, Innovación y Universidades DS Docta Complutense RD 12 abr 2026